Image texture not showing up on glossy material
I think there is some issue with unwrapping.
Check this method:


Select that object and enter into EDIT MODE.
Now select the whole object By pressing A key ( u need to press it twice to deselect and select whole object in edit mode)
Then press U key and select "UNWRAP"
No go to UV editor and check whether u have unwrapped the image correctly onto the image texture. 


This should work else, ping me back!